What are the best practices for handling and executing dynamic PHP code within a web application?

When handling and executing dynamic PHP code within a web application, it is important to sanitize and validate user input to prevent security vulnerabilities such as SQL injection and cross-site scripting attacks. Additionally, using prepared statements for database queries can help prevent SQL injection. It is also recommended to limit the use of eval() function as it can pose security risks. 

// Example of sanitizing user input before executing dynamic PHP code
$user_input = $_POST['user_input'];
$clean_input = htmlspecialchars($user_input);

// Example of using prepared statements for executing dynamic SQL queries
$stmt = $pdo->prepare('SELECT * FROM users WHERE username = :username');
$stmt->bindParam(':username', $clean_input);
$stmt->execute();

Keywords

dynamic PHP code web application security eval function input validation

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